How many compressions are needed for CPR?

When it comes to CPR, are 30 chest compressions currently being done during heart massage? Has anything changed? And apparently you no longer need to do mouth-to-mouth. Is that true? Help.

When it comes to CPR, are 30 chest compressions currently being done during heart massage? Has anything changed? And apparently you no longer need to do mouth-to-mouth. Is that true? Help.

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